Lifting-jack.



G. LANE.

LIFTING JACK.

AYPLICATION FILED MAY 8.1914.

Patented Dec. 22,1914.

2 SHEETSSHEET 1.

WIIE WE G. LANE.

LIFTING .IAUK. APPLICATION FILED MAYB, 1914.

1,1 22 ,2 7 Patented Dec.'22,1914

z SHEETS-SHEET 2.

ens-non LANE I COMPfillY,

hirliratziannicd Ma ficr siin m. w a 1 '3 H A To all whom may concern Beit known that 1, Greece Lens. citizen. of the United residing atFoughlzeepsie, New Yorlu, have lDVBXliJQCl cerhain new and usefulimprovements in Jacks, oi Whichizhe following is a specin cation.

My present invention relates to improvemenis in lifting jacks of shetype known step down. jacks, and has among objects to provide a deviceof this character capeble of economic productioin'oif extreme lightnesscombined with the requisite strength. and embodying raising andlOWGlflIlg mechanism free from loose screws, nuts or bolts, and ofextreme simplicity, thus reducing liability of derangementandfaeiliiating repairs or adjustment by the ordinary mechanic.

'lheinvention includes the novelfeatures of construction andarrangement; end coinbination of parts hereinafter described andparticularly defined by the appended claims.

A ack constructed in accordance with my invention is illustrated insheaccompanring; drawings, in Which Figure l is a side elereeion, partlyhrolren away. Fig. 2- is a viewat right angles be Fig. 1 looking towardthe right. Fig. 3 is a sectional elevation of the upper portion oi thejack. Fig. 4c is a section on line 4.--lof Fig. 8, and Fig, 5 is a.section on line 5-5 of Fig. 3.

Referring by reference cliaruefiers tothis drawingihe numeral 1desigi'iates the base which is preferably composed of a square plate ofsheet steel of desired size and thicle ness, and 2 e standard Withinwhich is guided the lifting; bar This slandard is of special formdesigned to secure combined li hcness and strength, and comprises pair0i channel irons 2 and 2" of steel or oiher suitable material ofdiilt'ereni; depths and lit.-

ting one Within the other, a s shown, so to leave a space between thebases i the channel irons and the side walls or the channel iron 2 whichreceives and guides the lifi3- ing bar. The edges of the channel ironsare securely riveted together. as indicated a, and the outer channel Q-lS provided at l' ZS lower end With outwardly turned integral Wings orflanges 2 which ere firmly secured tothebase by su table n such as rvelgs, ssindicahed-ieii 0. Thai 'eted or otherwise secured to e endoif'ilie standard the ii" is Gill) a m ins and. h

din

pair 4. passi edges 0% pawl is pivoiinlly conna. the lifting lever 3,.ferahly ing the end of the pa wl and reduci. of the liftii'ig lereriopert; .lv'Z ii; to lit uewrecn the legs of the pawl and he connec'zel tohv she pivot pin 7..

The lifting lever is niroicd her side plates 8 which. with the cover orcan 9. constituie a casing to receive the pawl controlling parts these.side nlaies 3 he L H .e LG 11116 3116. O1.

bi ill C3 L" side walls of she cl annel iron 2". The iii;- ing lever ispivoeallv inouuccd upon a nin 16 supported hv the plates. and theextensions or cellars S are provided on each side of the lifting leveror lree iiing it nronerljfi centered on she pin. lEv making; these ontensions or collars inteo'ral Willi the lii t uo: lever the latter isheld nroperl v centered and a longer bearing surface on the pigos pinafi o dcd.

The lift ng; and holding; oawls a mallv snring' uressecl town d li'F"ratchet l ar, and act alieruai 'l ner Well i need an etc-n shore a .lbelow a z through the pivot 01': the enema" lemr i"- Y 1 I I, w .Eliesehell cran; levers are aeaoted lo he mechanism nre'i erahlr in the form0'! snrina" inieruciino; between the "mo us is,

such for insliunce as the s rine; C. and when 1 i pushed toward lllfi'oaWl by suitahle spring;

alternately ride over the teeth of the lifting bar when the jack isoperated for lifting purposes as hereinbe fore referred to. Any form ofpushing connection may be used vto transmit the elastic tension of thespring C through the pawls. In order that the pawls may be operated toeffect the step by step lowering in the manner hereinafter described, itis necessary that there should be anelastic connection between the bellcranks 11 and 12 and the pawls 5 and 4 through whichsaid bell cranklevers will, when.

rocke on their pivots, tend to yieldingly pull on the pawls 5 and 4. Ifind that I can accomplish this double function of pushing on the pawlsin one direction and yielding or elastic pull on them in the oppositedirection by means of close coil springs 13 and 14C connectedrespectively to lugs or eyes on the pawls, and similar eyes on the endsof the bell crank levers. hen the bell crank levers are free to movetoward the pawls under the action of the spring C, the coils of thespring 13 and 14 being in contact, said springs act practically as rigidlinks, thus pushing the pawls toward the ratchet teeth, any yieldingpermitted to the pawls being due to the action of the spring C. It willbe apparent, however, that either of the bell crank levers 11 or 12being swung away from the p'awls 5 or 4-, this would place a tension onthe respective spring 13 or 14. In order to effect this movement of thebell. crank levers to pull the pawls, out of engagement with the ratchetteeth at the proper time to permit the lowering of the jack as thehandle is moved up and down, I provide means on the handle adapted tocooperate with the arms or portions 11 and 12 of the bell crank levers,this means on the handle or operating lever being -movable so that itcan be set in a position ineffective with relation to the bell cranklever during the lifting operation, and being shifted to effectiveposition for the step by step lowering. A convenient means of efl'ectingthis purpose is to provide a rotary contact member 15 thin andrelatively wide, and of such dimensions that when it is turned inhorizontal position it will move up and down with the lifting-leverwithout either of its flat sides coming in contact with the bell cranklevers. lVhen turned into a vertical position as shown in Fig. 3however, as the lifting lever is moved up and down, the upper and loweredges of the contact piece will alternately contact with the arms orportions 11 and 12 of the bell crank levers, rocking them on theirpivots and alternately placing tension on springs 13 and 14.

It is thought that the operation of the parts thus described in the stepby step lowering of the lifting bar will be apparent. but it may bebriefly stated as follows: lVith the contact piece turned vertically,

when the handle or lifting lever is lowered, the lower bell crank 12 isforced backwardly, stretching the spring 11-, and when the load is takenby the top pawl 5 the lower.

or holding pawl 4: is pulled by the spring out of engagement with theratchet teeth.

Then on raising the handle lever (3 (which lowers the load) the contactpiece releases the lower bell crank lever, which again takes up itsnormal position actuated by the spring C to push the pawl forward, andwhen the lifting pawl has been sulliciently lowered the holding pawlintercepts the next tooth and holds the bar 3 against further downwardmovement. In the meantime, the upward movement of the contact piece 15has rocked the bell crank 11, applying the tension to spring 13, so thatthe moment the weight of the load is taken by the holding pawl and theupper pawl relieved of the weight, the spring 13 immediately pulls theupper or lifting pawl out of engagement with the ratchet teeth. Ineither case the bell crank lever can not get back into its normalposition until the lifting lever has approached the center, that is,until there has been sufiicient movement for the pawl to pass the pointof the corresponding tooth in the rack.

A convenient manner of effecting the rocking of the contact piece orcontrol device is to provide it with a thumb or control lever 16. Theend of this control pin has a surface squared as indicated at 15 thatprojectsoutside theoperating lever on the opposite side and againstwhich a spring 17 presses, tending to hold it in either the raising orlowering rotativc position as placed. Outside of this the control leveris attached. A feature of this spring arrai'igement is that the controldevice will be thrown fully into position and held there, for as soon asit well passes center the spring aids in the movement. This avoids theobiections incident to careless operators failing to get the controllever fully into position as well as its failure to stay there.

In order that the lifting bar may be quickly lowered or released andallowed to drop when no load is on it, I provide the bell crank leverswith linger projections 11 and 19* which may be pressed toward eachother to simultaneously rock both bell crank levers and place bothsprings 13 and 14 under tension simultaneously.

The lifting lever is provided with the usual socket (3 to receive anextension lever (not shown).

Having thus described my invention what I claim is:

1. A jack comprising a standard or guide, a lifting bar, an actuatinglover, a lifting pawl and a holding pawl cooperating with said liftingbar, a spring for normally press 'ing said pawls into operative relationto the N new guide and. crept-ed lo engage the ratchet her, an colonellever, gin operating pawl piv; to the "ver ei'igsging the ratchet oer,spring; for pressing said pawls loword the ratchet bar, conno on thecornering lever for alterlying yielding tension to said ils lenolng lodrew them outwardly from Lie ratchet as the lever is-oscillsled solo--lv described.

53i: comprising standard or guide, our, an actuating lever pivoeollyineclzed with the gui l 7 s holding pawl the guide, 21 li'lling pziwlpivoled e pairnoi bell crank levers pivconnecled with the lifting lever,e i inlerociing between said bell crenlr levers and lending to push thepswls inlo eninen'; with "the ratchet oer, springs convell crank leverswith e 1e pelvis carried. by the actuating lever snid bell. crank leverses the ever is oscillated.

ill see. comprising a stendsrd or guide,

lll

or niovnlile longitudinally ll'iereof, lioldin owl pivclallv connectedwith she guide coo eereling Wllil'l sold can, an ac:-

lzneling leven llierewiili c pair of hell from nec'ling said 2; springinle vb su "pawl 'oivolellv connecl'ed with said loom ers pivolzellysupported. close coiled crenlelevers w lev lzli 'ing s s 'nricerd orguide,

crnnling 7 a lever pivolgellv guide s holding pawl guide on operatingpawl pivemailing lever, a pair of hell crank levers pivo'izsllysupnoreed from the standard 21 spring interacting; laelaween said loellcrnnl-r levers end tending to push the pewls into engagement with therelzcliet leer springs connecting the bell cranlr levers with thepaw'ls, a contact device carried by the cornering lever for operatingsaid bell crrinli levers es the need lever is oscillated, and

means for moving said seen sing device into end one of operativeposition will: relation lo said cell crank levers.

gnide, {l

v A eck comprising e nlndnrd or I e ljlll; en detecting lever n pnwl andlioldigngg pawl. cooperating; will lilteing leer, cl -sed UICESE S21.

lownrd die liar springs connecting said. bell crank levers with thepewls, and e conlace device carried by theeclueting lever and movableinto and out of the path of the bell crank lovers. 7

, 7'. ll. jack comprising a standard or guide,

e lifting bar, on actuating lever, a lifting said lilting bar, a springl'or normally press-' ing said pswls into operative relation to thelifting leer, a separate spring connected to (ifiCllPEiWl, and meansoperated by the actusling lever, for alternately applying tension tosaid separate springs, and means for rocking the bell crankssimultaneously. 7

9. A. jack comprising; a si'sndard-or guide, all actuating lever, a.lifting pawl and e holding car, a of bell crank levers pivotallsupported from the standard and adapted to press seid pewls toward thelifting bar, e ll? shaped spring having its ends connected to said bellcrank levers, elastic connections between the bell crank levers andpawls,

pawl cooperating with seidlii'ling nd a contact device carried by theoperating lever guide a lifting bar, on actuating lever, a liftingpewlend 'llolding pawl cooperating with said lilting bar, a pair ofspringpressed bell crank levers pivolally supported from the standardand adopted to press pawls toward the lifting bar, springs connectingsaid bell crank levers with the pawls, and e rotary contact devicecarried by the actuating lever and having a contact portion adapted tocontact with said bell crank levers in one position of the contactdevice.

ll. A jack comprising e standard or guide, a lillingloar, an actuatinglever, e lifoing pawl and a holding pawl cooperating with said liltingbar, a pair of springpressed bell crank levers pivotnlly snpported fromthe standard and adapted to press said; pswls toward the lifting barsprings connecting said bell crank levers with the pelvis, and a rotarypin carried by said cornering lever and having e thin and rolelivelywide portion projecting between said bell crenlr levers, substantiallyas described.

15% 'l l: comprising a vstinderd or guide, lg ber an actuating lever, 51filling pevm and e holding pawl codperel circular portion, and acontrolling spring bearing against said non-circular portion.

In testnnony whereof, I aihx iny signature in presence of two witnesses.

GEORGE LANE. Vitnesscs:

WM. C UCK, C. J. Bnownn.

